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Sishuo Chen

10 accepted papers

2025

Probe before You Talk: Towards Black-box Defense against Backdoor Unalignment for Large Language Models

ICLR 2025poster

Backdoor unalignment attacks against Large Language Models (LLMs) enable the stealthy compromise of safety alignment using a hidden trigger while evading normal safety auditing. These attacks pose significant threats to the applications of LLMs in the real-world Large Language Model as a Service (LL…

2024

BadActs: A Universal Backdoor Defense in the Activation Space

ACL 2024findings

Backdoor attacks pose an increasingly severe security threat to Deep Neural Networks (DNNs) during their development stage. In response, backdoor sample purification has emerged as a promising defense mechanism, aiming to eliminate backdoor triggers while preserving the integrity of the clean conten…

2024

TempCompass: Do Video LLMs Really Understand Videos?

ACL 2024findings

Recently, there is a surge in interest surrounding video large language models (Video LLMs). However, existing benchmarks fail to provide a comprehensive feedback on the temporal perception ability of Video LLMs. On the one hand, most of them are unable to distinguish between different temporal aspe…

2024

Watch Out for Your Agents! Investigating Backdoor Threats to LLM-Based Agents

NeurIPS 2024poster

Driven by the rapid development of Large Language Models (LLMs), LLM-based agents have been developed to handle various real-world applications, including finance, healthcare, and shopping, etc. It is crucial to ensure the reliability and security of LLM-based agents during applications. However, th…

2023

Communication Efficient Federated Learning for Multilingual Neural Machine Translation with Adapter

ACL 2023findings

Federated Multilingual Neural Machine Translation (Fed-MNMT) has emerged as a promising paradigm for institutions with limited language resources. This approach allows multiple institutions to act as clients and train a unified model through model synchronization, rather than collecting sensitive da…

2023

FETV: A Benchmark for Fine-Grained Evaluation of Open-Domain Text-to-Video Generation

NeurIPS 2023poster

Recently, open-domain text-to-video (T2V) generation models have made remarkable progress. However, the promising results are mainly shown by the qualitative cases of generated videos, while the quantitative evaluation of T2V models still faces two critical problems. Firstly, existing studies lack f…

2023

TESTA: Temporal-Spatial Token Aggregation for Long-form Video-Language Understanding

EMNLP 2023long findings

Large-scale video-language pre-training has made remarkable strides in advancing video-language understanding tasks. However, the heavy computational burden of video encoding remains a formidable efficiency bottleneck, particularly for long-form videos. These videos contain massive visual tokens due…

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2022

Expose Backdoors on the Way: A Feature-Based Efficient Defense against Textual Backdoor Attacks

EMNLP 2022finding

Natural language processing (NLP) models are known to be vulnerable to backdoor attacks, which poses a newly arisen threat to NLP models. Prior online backdoor defense methods for NLP models only focus on the anomalies at either the input or output level, still suffering from fragility to adaptive a…

2022

Holistic Sentence Embeddings for Better Out-of-Distribution Detection

EMNLP 2022finding

Detecting out-of-distribution (OOD) instances is significant for the safe deployment of NLP models. Among recent textual OOD detection works based on pretrained language models (PLMs), distance-based methods have shown superior performance. However, they estimate sample distance scores in the last-l…

2021

Translation as Cross-Domain Knowledge: Attention Augmentation for Unsupervised Cross-Domain Segmenting and Labeling Tasks

EMNLP 2021finding

The nature of no word delimiter or inflection that can indicate segment boundaries or word semantics increases the difficulty of Chinese text understanding, and also intensifies the demand for word-level semantic knowledge to accomplish the tagging goal in Chinese segmenting and labeling tasks. Howe…